Perhaps you should try some spelling variations:
"an introduction using subsampling program" » "an introduction using sampling program" (Expand search), "an introduction during subsampling program" (Expand search), "an introduction seeing subsampling program" (Expand search), "an production using subsampling program" (Expand search), "an introduction and subsampling program" (Expand search)
"using coding python python programming" » "using codigo python python programming" (Expand search), "using codigos python python programming" (Expand search), "using using python python programming" (Expand search), "using coding pythons python programming" (Expand search), "using coding piton python programming" (Expand search), "using coding pitons python programming" (Expand search), "using coping python python programming" (Expand search), "using coating python python programming" (Expand search), "using cooking python python programming" (Expand search)

You may be able to get more results by adjusting your search query.

• The words AND, OR and NOT may confuse the search; try adding quotes: "((\"an introduction using subsampling program\") OR (\"using coding python python programming\"))~".
• Removing quotes may allow a broader search: (( an introduction using subsampling program ) OR ( using coding python python programming ))~.
• Adding a wildcard symbol may retrieve word variants: (("an introduction using subsampling program") OR ("using coding python python programming"))*.